wow this is getting into a real "gone with the wind epic" (i actually loved the movie)
Just a quick note, I was the Supercheap Auto quality/product development manager for 7 years, after that I worked for a Chinese manufacturer for 5 years who make battery chargers, inverters and battery packs/jump starters and solar panels etc.
Whilst I don't know everything and don't profess to by any stretch, but I have personally audited so many factories in China that make all of the above I dont think i have missed too many.
Now
@Drover you must remember
@Joves drives a Toorak Taxi similar to my Jeep but with less power, (unlike the utility thingy you drive with a 6x3 metre garage on the back) and he has a car load of billy lids so space is tight, real tight!!! Now the guy I hired to replaced me a SCA has become a really good friend and is a caravanner and fisher, he to is an Auto electrician around 10 years my junior and 10 times smarter, only last week we were talking solar blankets and solar regulators and discussing the factories who manufacture their range, long story short they are excellent bits of gear, win win just wait for the specials!!
Now as far as batteries are concerned if you don't want to run a hair dryer or or a coffee machine (not sure as you come from Sydney) why do you need sh!t loads of batteries??? 2 AGM's or of course 2 Lithiums would be more than enough all they do is run a few lights, TV and water pump (you can't carry enough water to run the battery flat pumping water, yes the TV draws a bit but with kids bed time will probably see it off early. Now the importent stuff, the BEER has to be cold, and yes the Waeco is a great means of performing this task (not sure about sharing the space with food, never tried it personally) There are 2 decent battery packs available 1) Thunder (we produced it) it has a very agricultural feel to it, you might even cut your fingers on the p!ss poor injecton moulding but electrically it is a great unit and has the better 240V charger of the lot 2) the Projecta unit, I have tested it and it seems okay as well, these are the only 2 worth considering IMO. For anything else, i.e brake controller, inverters and DC to DC chargers Redarc is the go to place. I hope this ramble is some help